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(No Model ZSheets-Sheet 1.

H. S. MAXIM. Process of and Apparatus for Manufacturing Phosphoric Anh-ydri der i No. 239,394. Patented March 29,1881.

(No Model.) 7 2 Sheets-Sheet 2.

v H. S. MAXIM. Process of and Apparatus for Manufacturing Phosphoric Anhydride.

No. 239,394. I Patented March 29, 1881.

i 4:3 F 0 I Mu e 53 5.

MPETERS, PHDTO UTHOGRAFNER WASHINGTON. D C. I

UNITED STATES PATENT OFFICE.

HIRAM S. MAXIM, OF BROOKLYN, ASSIGNOR, BY MESNE ASSIGNMENT, TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF'NEW YORK, N. Y.

PROCESS OF AND APPARATUS FOR MANUFACTURING PHOSPHORlC ANHYDRIDE.

SPECIFICATION forming part of Letters Patent No. 239,394, dated March 29, 1881.

Application filed May 8, 1880. (No model.)

To all whom may concern: i a, and especially its upper part, at a higher Be it known that I, HIRAM S. MAXIM, temperature throughout the operation than 5 the city of Brooklyn, county of Kings, and the vessel A so that there can be no conden- State of New York, have invented a certain sation of the vapor of phosphorus after it is 5 new and useful Process of Manufacturin gPhosonce formed. As the vapor passes out through phoric Anhydride, (1 0 of which the folthe upper end of the tube a it is caught by lowing is a specification{reference being had the jet of air from the injector G and carried 60 to the accompanying drawings, which form a through the tube a into the receiving-champart hereof. ber B. At the same time it is thoroughly I have shown in the drawings an apparatus mixed with the air and enters into chemical suitable for performing the process which 1 union with its oxygen, thus forming phos- I have invented; but I do not wish to be limphoric anhydride, which is condensed in the 6 ited to the apparatus shown,as the particular chamber B and falls down through the pipe form of the apparatus is not essential. 1) into the receptacle D. The dimensions of In the drawings, Figure 1 is a side elevathe injector G and the tube a are so adjusted tion of the apparatus, partly in section and that the amount of air supplied is always in Fig. 2 is a view of the same in perspective. excess of the quantity required for oxidizing 0 Similar letters of reference refer tolike parts to saturation all the phosphorus admitted, in each. so that none of the lower oxides of phosphor A is a closed vessel containingphosphorus. us are formed. The atmospheric nitrogen B is a receiving chamber for condensing and the excess of oxygen escape through the and collecting the phosphoric auhydride. It vent 'b, and in order to insure the best results 7 5 has a discharge-pipe, b, at thelower end and a the vent should be opened sufficiently to alvent, b, at the upper. low them to escape freely, even if a slight G is ajacket surrounding the chamber B. amount of the auhydride is blown out by them.

D is a bottle or other suitable receiving-ves- The chief difficulty encountered in the prosel placed under the discharge-pipe b. cesses now in use is the formation of more or 80 E is a bellows or blower worked by the less of the lower oxides on account of cocatreadle e. sional deficiency in the supply of oxygen, and

F is a drying tube or chamber, filled with this difficulty is entirely obviated by the procalcium chloride or other suitable drying macess above described, for as soon as the vaterial, and connected with the blower E by per of phosphorus issues from the tube a. it is 8 means of the pipe 0. thoroughly mixed with a volume of free oxy- G is an injector opening into the chamber gen in excess of its requirements for the for- 5 B through the tube a, and connected with the mation of the highest oxide, and the phoschamber F by means of the pipe f. phorus takes up all the oxygen for which it H and l are Bunsen burners or gas-jets, aphas any chemical affinity. 9o plied to heat the vessel A and its outlet-tube a. Having described my invention, what I n In using the apparatus the jacket 0 is filled claim as new, and desire to secure by Letters 0 with cold water up to apoint somewhat above Patent, is

thetube a, so as to keep thereceiving-chamber 1. The process hereinbefore described of B at a low temperature, and a strong blast of making phosphoric anhydride, which consists 5 air is forced into the chamber B through the in bringing together a jet of vapor of phospipese and f and theinjectorG by means of the phorus and a continuous blast of air of suffi- 5 bellows E, and is allowed to escape through cient volume to oxidize all of such phosphorthe vent b until the chamber is filled with dry us to its highest equivalency. air, the moisture of the air supplied being 2. The combination of the injector G and 100 thoroughly removed. by the drying material pipe at with the blower E and vessel A and in the chamber F. While the current of air the burners H and I, arranged substantially is still passing the burners H and I are lighted, as described. and heat is gradually applied to the vessel A Witnesses: HIEAM S. MAXIM.

until the phosphorus contained in it is volatil- L. H. LATIMER, ized. Care should be taken to keep the tube J. F. NOBLE. 

